How to Read a Rent vs Buy Break-Even Result
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A crossover is a month in a particular scenario, not the date when buying becomes permanently better. Read it beside the exit assumptions, your actual planned stay and the full net-asset paths.
Compare exit assets, not monthly payments
At each potential exit month, the buyer path includes estimated sale value minus remaining loan principal and selling costs, plus any invested monthly savings. The renter path includes its investment balance and a recoverable deposit. The tool reports buyer minus renter. A positive difference favors buying within those inputs; a negative difference favors renting; near zero is a modeled tie. It is not a recommendation to transact.
A mortgage payment includes both interest and principal. Principal reduces debt; it is not an additional exit cost. Sale fees and remaining debt reduce equity at the end. A monthly rent-versus-mortgage comparison misses all three effects.
What the first crossing means
The first crossing is the earliest evaluated month for which buyer-minus-renter exit assets are nonnegative. The calculation evaluates each month through the selected horizon; it does not extrapolate beyond it. Check the table after the first crossing. Higher rent growth, a late repair or different investment returns can make the line cross again. The result should identify any later reversal rather than promise a permanent threshold.
If the difference is already nonnegative before month one, that is a month-zero advantage, not a crossing caused by payments. If no month within the selected period reaches zero, the correct conclusion is no modeled crossover within this horizon. It does not prove buying can never catch up.
Worked 12- and 18-month comparison
Consider the deliberately simple example in the assumptions worksheet: price 120,000, down payment 20,000, zero-rate 100-month loan, and monthly rent 1,000. Now add 6,000 buyer closing cash and 10% selling costs, with all other costs and returns zero. At month 12, buyer exit assets are 20,000 while renter exit assets are 26,000: renting is ahead by 6,000. The first tie arrives at month 18, with each path at 26,000. A household planning to move after 12 months should read the 12-month result, not the later tie.
This arithmetic isolates the holding-period effect; it is not a realistic housing forecast. Real rates, taxes, repairs, rent changes and sale prices would move the line. Test a different holding period and independently vary appreciation and investment return.
Read sensitivity without calling it probability
A sensitivity panel asks, "What if this one assumption changes?" It is not a confidence interval or probability forecast. Try a shorter and longer stay, lower sale price, higher ownership costs and a negative alternative return. Keep all other inputs fixed for each comparison so you can see which assumption moves the result. Record the property and lease evidence behind your baseline.
The amortization guide explains the remaining loan balance; the housing hub connects the affordability and comparison tasks.
Frequently asked questions
Why can a home gain value while renting still leads?
Closing and selling costs, ownership cash outflow and the investment of unused upfront money can offset appreciation.
Is a near-zero difference an exact tie?
Only within the stated display tolerance. Reopen the unrounded assumptions and inspect nearby months before treating a small displayed difference as meaningful.
What if I cannot predict the sale date?
Run several plausible holding periods. A result that reverses across them is sensitive to timing.
Sources and scope
CFPB housing-budget guidance identifies costs that a payment-only comparison omits. CFPB closing-cost guidance illustrates transaction-cost variability. Sources checked October 2, 2026. Crossover timing is CalculatorGeek's explicit scenario model, not a CFPB prediction.
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